I found this code in a RailsCast: def tag_names @tag_names || tags.map(&:name).join(\' \') end What 开发者_如何学运维does the (&:name) in map(&:name) mean?It\'s shorthand for tags.map(&
MDN claims that: The comma operator evaluates 开发者_StackOverflowboth of its operands (from left to right)
I always thought that && operator in Java is used for verifying whether both its boolean operands are true, and the & operator is used to do Bit-wise operations on two integer types.
I am reading into C++ a little bit and was wondering if someone could explain some differences of some of the class operators to me. The operators in question are:
It is possible to use the ?开发者_运维百科? operation in a situation such this: string str = collection[\"NoRepeate\"] ?? null; // Will not compile
Is this a valid way to take a list of digit characters and use them to create a long integer? LongInt operator+(const LongInt& x, const LongInt& y)
is it possible to define an extension method that at the same time is an operator? I want for a fixed class add the开发者_如何转开发 possibility to use a known operator that actually can\'t be applied
This question already has answers here: Closed 11 years ago. Possible Duplicate: Double Greater Than Sign (>>) in Java?
What is the C++ code below doing? More specifically, what is the operator |=? long liFaultFlags = 0; for (int i = 0; i < FAULTCOUNT; i++)
Coming from PHP I understand the difference in using == verses === in a comparison operation, but with JavaScript is it acceptable to use == or =开发者_运维问答==?
加载中,请稍侯......